I have a classic 85. I like to roll the rear door windows up and down after washing the car and drying the glass. Unfortunately there were times when the rear window switches would not work. I spent a lot of time trouble shooting this issue. Now I've discovered that unless the key is inside the car the rear window switches are disabled. Simple fix is to put the key inside the car after washing! The key sensor is much closer to the front doors so they have always worked with the key in my pocket.